In conducting materials electrons are ________ bounded with atoms.

Let (Delta)E denote the energy gap between the valence band and the conduction band.The population of conduction electrons (and of the holes)is roughly proportional to e^(-Delta E//2kT). Find the ratio of the concentration of conduction electrons in diamond to that in silicon at room tempareture 300K. (Delta E) for silicon is 1.1 ev and for diamond is 6.0eV.How many conduction electrons are likely to be in one cubic meter of diamond ?

Assertion : Pholem conducts food materials to different parts of the plant. Reason : Xylem conducts water and minerals to different parts of the plant.

In diamagnetic materials the net magnetic moment of atoms is .............. .

In the formation of a _________ , both the combining atoms contribute one electron each and the these electrons are mutually shared among them.

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10^(40) . An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting,

When a neutral atom loses and electron, it forms a __________.